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IBM Lenovo model 8639-1RY, an entry level server circa 1996

Bill-kun

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Trying to get this unit working. New acquisition. Nothing seems wrong with it on the outside. The inside looks pretty clean.

IBM Lenovo PC Server 325
Model number 8639-1RY
High-volume, entry-level server
Made circa 1996

  • When powered up
    • Keyboard lights blink once, as normal
    • CD drive light blinks continuously
    • No beeps
    • No output to video
    • Front lights are solid in this pattern:
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Here is the only technical info I could find about it: https://everything.explained.today/Lenovo_System_x/
 
I can't zoom in to the pictures to read the light pattern, but normally there is a guide to light faults on the inside of the lid or side panel.
This also pre-dates any Lenovo involvement, You won't find any info on the Lenovo sites. Try searching for

"ibm server model 8639 manuals"

or similar. It comes up with several hits for the supplement


which might help.
 
This also pre-dates any Lenovo involvement, You won't find any info on the Lenovo sites.
Maybe I added the name Lenovo myself. I can't quite remember.

I can't zoom in to the pictures to read the light pattern, but normally there is a guide to light faults on the inside of the lid or side panel.
I will look on the inside side panel when I get a look at it next. Here is a picture I hope is better.
IMG_7129 - Copy.jpg

The lights don't have any labeling except for symbols, and a lot of them I am having to guess at. The symbols look to me like they mean:

PowerReset
THDD activity
CPU 1CPU 2
SendReceive
Power OKLock

I saved the manual from the link, but unfortunately it doesn't give any troubleshooting for a situation like this.

To be clear, these are not specifically error lights. These are normal operation status lights that I am trying to use to help tell what the status is, since it's not operational enough to output video. (Maybe I should try swapping the video card, come to think of it.)
 
Possibly a good idea to open the case and look what cards are missing. Since no one would leave two slots uncovered on a server while it was being used, there were certainly two cards removed afterwards.

And I'd guess there's no hard disk in there either.
 
I was hoping the manual would help :-( I would start by removing all cards except the video. Also unplug disk drives if plugged to Planar (IBM speak for motherboard) I can't remember when IBM brought in motherboard fault lights.

I also found a user guide which explains the lights...
hope this helps
Ah, thank you so much! Manuals, yum! I've immediately saved it to my modern computer's hard drive.
1641399836882.png1641399858223.png


Unfortunately, the troubleshooting guide of this user handbook is as helpful for this situation as the joke about lost plane pilot and the Microsoft building. 🛩️🏢 "Have the system serviced." (Like when Windows on your home computer tells you "Contact your system administrator" and you are the system administrator. :rolleyes:)

1641430366289.png
Well, the 4 lights that are solid are:
  • Power
  • POST activity indicator
  • SCSI HDD indicator
  • Security indicator
Maybe the security indicator light being on means that the system is locked somehow and therefore won't try booting?
"Security Indicator: When tamper-detection software is installed and enabled, this amber LED shows that a security hardware error occurred."
That is all the user handbook says about that light. It says there is a security feature in the BIOS, but since the unit won't even boot to a point where a legitimate user can enter the system password, I don't think that is the problem. Can some security setting in the BIOS qualify as "tamper-detection software," or would it need a hard drive for whatever software it's talking about?

Somebody didn't swipe the CPU card did they? Should be in the bottom 'not eisa/pci' slot.

Possibly a good idea to open the case and look what cards are missing. Since no one would leave two slots uncovered on a server while it was being used, there were certainly two cards removed afterwards.

And I'd guess there's no hard disk in there either.

Here are photographs of the inside. The VGA port is actually integrated into the motherboard. There may or may not have been an additional video card. Personally, I doubt so, since this is a server. The CPU card looks completely present; both Pentium II CPUs have large heat sinks with the front-panel cooling fan blowing on them. The expandable memory slots looks fine and populated at a glance. There are no other expansion cards present. The two non-covered expansion slots are both PCI slots. If there was a permanent internal hard drive, it was removed. The motherboard has integrated SCSI and there is a SCSI wire with 4 connectors for devices, all unpopulated. The white front panel is a removable hard drive drawer, which came to me unpopulated as part of the unit.

IMG_8385_large.jpgIMG_8386_medium.jpg
 
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Sadly older IBM manuals were light on info. The security indicator merely shows some one has opened the lid. It seem to remember it says somewhere in the manuals that CPU2 should run the boot process, but its light is out. Try booting with just one CPU in place?
 
Could be the lighting, but it looks to me like there's some nasty corrosion on that cpu board, the screw toward the front and a component along the edge near the middle of the cpu slot in particular. Might pull the board out, remove everything socketed and give it a good cleaning.
 
The pictures probably make it look worse than it is. The only oxidation in the unit is on some relatively large portions of the inside of the case, but it is not thick at all. The circuitry looks fine. There is some dust coating the circuitry, again not thick at all. It might look worse than it is in these high-lighting pictures.

I pulled out the CPU board and reseated it. No change. I removed it again and removed each CPU. They look fine to the naked eye. I was going to put the CPU board in and try it with only one of the CPUs, then I decided to try it without the CPU board entirely. There was no difference in behavior; same lights, same no beeps, same no display output. So the computer is not even acknowledging that the CPU board is connected.

Since the problem occurs so early in the boot process, I was wondering if it could be an absence of BIOS chips. I see no removable chips anywhere, except for 2 unpopulated sockets on the motherboard, in the lower left of this picture. Maybe one or both of those is for the BIOS? I found a date code on the internal parallel cable of late 1997. Was an IBM BIOS of this era still on removable chips?

Could it be as simple as a blown capacitor on the motherboard next to the power supply connector? I measured one of the loose Molex connectors and the +12 and +5 V. are both fine.
IMG_8400_large.jpgIMG_8402_large.jpgIMG_8401_medium.jpgScreenshot 2022-01-07 001600.jpg
 
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Since the problem occurs so early in the boot process, I was wondering if it could be an absence of BIOS chips. I see no removable chips anywhere, except for 2 unpopulated sockets on the motherboard, in the lower left of this picture. Maybe one or both of those is for the BIOS? I found a date code on the internal parallel cable of late 1997. Was an IBM BIOS of this era still on removable chips?

Could it be as simple as a blown capacitor on the motherboard next to the power supply connector? I measured one of the loose Molex connectors and the +12 and +5 V. are both fine.
I would suggest those sockets are for video expansion. They are next to the S3 VGA chip and some of my S3 cards have identical sockets. Blown capacitor if its blown short could affect operation.
 
Yep, the two empty sockets are video ram expansion, right below them are the two onboard video ram chips. BIOS is probably that Intel flash chip towards the front lower corner. At this point, I'd advise getting a POST card. Might pull all but one stick of ram and see what that does. Could try swapping the voltage regulator modules (the two modules with the big capacitors on the CPU board). If the boot CPU VRM is messed up, swapping it with the secondary might give signs of life.
 
Another one: with that security light on, does it have a 'case open' detection switch? I've seen those disable power up.
I see no switch that gets triggered when the case is opened.

From the user's handbook, PDF page 17:
1641700552518.png

In the subsection on security starting on PDF pages 42-46, it talks a lot, but only about configuring passwords. So that can't be the problem, since for the security options to apply, the computer has to be functional enough for the user to get a video output and be able to enter the correct password(s).

If the boards and contacts all look clean, what would make the motherboard not recognize the CPU board?
 
Agree with the others already. I had an S3 PCI card with those exact sockets for VRAM.
Some further thoughts:
  • Are the fans OK? I know many servers will go into self-protect mode if a fan is not present or has failed
  • Appears there's additional power (the green leads) going to the mobo - is voltage up to spec there too?
Another thing you can check is jumpers. Your beast can take PII or Pentium Pro CPUs - but the jumper needs to be set correctly:
1643801854683.png

I've seen servers refuse to POST due to incorrect RAM matching - some only like it when you have RAM installed in specific pairs/sets.

More config/jumper details here: https://stason.org/TULARC/pc/motherboards/I/IBM-CORPORATION-Pentium-II-Pentium-Pro-PC-SERVER-3.html

The newer IBM servers have advanced "Light Path Diagnostics" which give much more error detail. Perhaps it will give you some pointers. For example, DASD is disk/RAID error, VRM (VPU VRM), PS1/2 is power supply.

1643801563828.png
 
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